Truck box dumping devices



July 14, 1959 o. YACKEL 2,894,785

TRUCK BOX DUMPING DEVICES Filed July 8. 1953 3 Sheets-Sheet 1 y 14, 1959o. YACKEL 2,894,785

TRUCK BOX DUMPING DEVICES Filed July 8, 1953 -3 Sheets-Sheet 3 as 5 5/ XI I. 20X

United States Patent TRUCK BOX DUIVLPING DEVICES Otto Yackel, Yorkton,Saskatchewan, Canada Application July 8, 1953, Serial No. 366,839

3 Claims. (Cl. 29822) The invention relates to a truck box dumpingdevice and a general object of the invention is to provide a box dumpingunit which can be easily and quickly mounted on an existing truck frameand connected to the box and utilized to rearwardly dump the loaded boxas and when required and to return the box to its normal horizontalposition, on the truck frame.

A further object is to provide in combination with a rearwardly dumpabletruck box, a unit embodying a pendant cradle pivotally suspended fromthe truck frame, and pivotally supporting a cylinder with fluid actuatedpiston and piston rod and having the free end of the rod pivotallyconnected to the under part of the box structure.

A further object is to provide means for elevating the cradle andcylinder to a position where they will be well clear of the roadway orfield after the load has been dumped and the box has returned to itsnormal horizontal position on the truck frame.

A further object is to provide a unit presenting a frame for mounting onand to become secured to the truck frame in a desired position, aplurality of similar, pendant, transversely positioned and alignedcradles pivotally suspended from the unit frame, a cylinder associatedwith each cradle and having its lower end pivotally secured to the lowerpart of the cradle, a piston and piston rod operatively associated witheach cylinder and having its extended upper end pivotally connected tothe under part of the box structure and means for simultaneouslyactuating all pistons by controlled hydraulic pressure.

A further object is to provide means for automatically andsimultaneously swinging the cradles forwardly and upwardly upon the boxhaving been dumped and returned to its normal, horizontal position.

A further object is to utilize guided cables secured to the cradles andconnected to a common tension spring the tension of which can beadjusted and arranged such that upon thebox having returned from dumpingposition to normal position, the spring automatically raises the cradlesand cylinders where they are well clear of the road or field.

A further object is to provide a truck box dumping device utilizingsimilar, transversely aligned, pendant cradles pivotally carried by thetruck frame, similar cylinders having their lower ends pivotallyconnected to the lower parts of the cradles, the cylinders provided withpistons and extending piston rods pivotally connected to the under partof the box structure, the several pivot points being contained in thesame plane during box dumping operation under fluid pressure in thecylinders and to supply means for automatically swinging the cradles andcylinders upwardly and forwardly to positions clear of the roadway orfield and positioned such that upon fluid pressure being subsequentlyapplied to the pistons the cradles and cylinders automatically returnunder fluid pressure to their pendant load lifting positions.

With the above more important objects in view and certain other minorobjects which will become more apparent as the description proceeds, theinvention conthe box in a chosen location. The unit is now describedsists essentially in the arrangement and construction of partshereinafter described reference being had to the accompanying drawingsin which:

Fig. 1 is a perspective view of a truck frame having a rearwardlydumpable box and supplied with my invention.

Fig. 2 is an enlarged vertical sectional view through the boxunderstructure and the rear part of the truck frame and showing theposition taken by the cradle and cylinder at the time the loaded box isto be dumped.

Fig. 3 is a cross sectional view at 33 Fig. 2.

Fig. 4 is a view showing a modified way of pivotally suspending thecradle from the frame of my unit. I

Fig. 5 is a view showing one of the cradles and associated cylinder asthey appear when they have been raised to clear the roadway or field.

In the drawings like characters of reference indicate correspondingparts in the several figures.

In the drawings I have considered it only necessary to show the rearpart of a conventional truck frame and the conventional rearwardlydumpable box mounted thereon, as both of which are commercially Wellknown.

The side members or opposing channel irons of a truck frame areindicated by the reference numerals 1 and Z and the conventionalrearwardly dumpable box mounted on the truck frame is indicatedgenerally by the reference number 3 and embodies the usual boxsupporting side sills 4 and 5.

The rear ends of the sills have downwardly extending side plates 6 and 7permanently secured thereto and these are herein shown as mountedpivotally on stub axles or short pins 8 secured to blocks 9 welded tothe undersides of the side members 1 and 2 of the truck frame, sucharrangement being to permit of the rearward dumping of the box byraising the forward end thereof.

In equipping a truck with a rearwardly dumping box as above described Isupply a unit which can be easily and quickly mounted on and supportedby the side members of the truck frame in a desired location and whichembodies all the elements required to dump the box and return it,provided certain of the elements are secured to in detail.

A suitable, substantially rectangular, rigid frame 10 is supplied, suchbeing herein shown as embodying forward and rear cross members 11 and 12connected by pairs ofspaced bars 13 and 14. The members 11 and 12 areherein shown as formed from two angle bars welded.

- flanges positioned as best shown in Fig. 3. This rectangular frame issupported by the side members of the truck frame, the ends of the crossmembers 11 and 12 overlying the truck frame side members and beingsecurely fastened thereto, as by welding, in a desired location,depending on the type of truck and box.

Each pair of bars 13 and 14 provide a pivotal support for a cradle 15which presents a pair of side arms 16 and 17 interconnected by asubstantial base member 16*. The upper ends of the arms are connectedpivotally by bolts or pivot pins 18 to suitable hangers 19 secured tothe angle bars 13 and 14, as shown in Fig. 3. In Fig. 4 a modifiedarrangement is shown, two hangers 19 and 19 being used to carry thepivot bolt 18, such being both welded to the bars 13 and 14 with thearms 16 and 17 entered therebetween. Obviously any desired dependablemounting could be supplied for the purpose.

The cradle base member 16 is pivotally connected at 20*, in eachinstance, to the lower end of a cylinder 20 entered between the arms 16and 17 and the cylinder is supplied with a piston 20' from which apiston rod 21 extends, the rod passing slidably through the upper end orPatented July 14, 1959 head 22 of the cylinder. A flexible hose 23 isconnected to the lower end of each cylinder and leads to a valvecontrolled source of fluid pressure supply such as oil. It is commonpractice on trucks, tractors and such like to utilize hydraulic pressureto actuate cylinder pistons for a desired purpose and to permit of theescape of the fluid (oil) from the cylinders and on such account it isconsidered suflicient for the purpose of this invention to understandthat an attendant permits oil under pressure to enter the cylinders whendesired through the hose 23 and subsequently gives a setting that allowsthe oil to escape from the cylinders in the well known manner.

The rear member 12 carries centrally and slidably an adjustable bolt 24having the rear end threaded to receive a nut 24' and the front endconnected to a tension spring 24?. The forward end of the spring hastwo, similar pulling lines or cables 25 and 26 secured thereto whichcables extend forwardly and diverge, each cable passing over a guidepulley 27 suitably mounted on one of the inner bars 14 and thenextending downwardly and having its free end secured to a cross rod 28suitably fastened, as by welding, to the rear edges of the side arms ofthe adjacent cradle. The upper end of each piston rod is fashioned asindicated at 29 to receive a pivot pin 29'.

The above completes the description of the unit.

When the unit is to be introduced on a truck, the frame is placed in aselected position on the truck frame with the ends of the cross members11 and 12 resting on the truck frame members 1 and 2 and securelyfastened thereto, as by welding. The upper ends of the piston rods arethen pivotally connected by the pins 29 to the understructure of the boxand in this connection it is mentioned that most boxes have channelirons 30 extending between the side sills 4 and 5 and it is to such thatthe upper ends of the piston rods are connected pivotally by the pins29'. If no cross bar exists in the right location one can be suppliedfor the purpose.

When the box is in its normal horizontal position, resting on the truckframe, one adjusts the tension of the spring by manipulating the nut 24and as the nut is tightened up, the spring, through the cables swingsthe cradles with cylinders to what may be termed their up position wherethey will remain to maintain ample clearance space between them and theroadway or field. They are shown in their up position in Fig. 5.

When it is desired to dump the box of a contained load, the truckoperator will actuate the well known control to permit fluid underpressure to simultaneously enter the lower ends of the cylinders.Obviously the admitted fluid under pressure will then cause the pistonsto be actuated with the result that the cradles and cylinders will beforced downwardly until they reach a position that the pivot pointsspecifically indicated at A, B and C in Fig. 2 are contained in the sameplane, the point C being then in a dead central position between those Aand B. Having reached this position, continued fluid pressure will causethe pistons to lift the forward end of the truck box to a load dumpingposition. When the box has been tilted to a sufficient height todischarge its load the oil is released in the well known manner from thecylinders and the box returns to its original position. After the boxhas so returned, the spring then acts to raise the cradles withcylinders to their forward up positions as appearing in Fig. 5.

To avoid undersirable shock when the box returns to its horizontalposition, I have provided the truck frame with rubber or such likebumpers 31 on which the forward end of the box normally rests.

What I claim as my invention is:

1. The combination with a truck chassis frame and a box normally restedthereon and pivotally mounted to the frame for tilting movement aboutits pivoted end, of a secondary frame secured to the chassis frame in alocation in advance of the pivoted axis of the box, a pair of pendantside arms having their upper ends pivotally secured to said secondaryframe for forward and rear sway, a base member permanentlyinterconnecting the lower ends of said arms and a hydraulically actuatedram interposed between the said arms and having its one end pivotallyconnected to said base member and its other end pivotally connected tothe underside of the box.

2. The combination with a truck chassis and a dump box normally restedand pivotally mounted thereon for tilting movement about its rear end,of a pair of pendant side arms having their upper ends pivotallysupported from the frame in a location in advance of the pivoted axis ofthe box and a hydraulically actuated hoisting device having its one endpivotally carried between and by the extending lower ends of said sidearms and its other end pivotally connected to the under side of the box,the pivotal points of the side arms and those of the apparatus being sopositioned that in the entire hoisting movement of the box said pivotpoints are maintained in a common plane.

3. The device as claimed in claim 2 wherein means is provided to raisethe pendant side arms forwardly to an up position underlying the box andsubsequent to the return of the box to rested position following thetilting thereof.

References Cited in the file of this patent UNITED STATES PATENTS1,858,797 Wood et al. May 17, 1932 1,925,296 Barrett Sept. 5, 19332,509,911 Dore May 30, 1950 2,603,518 Golay July 15, 1952 FOREIGNPATENTS 654,962 France Dec. 7, 1928

